Martin kennedy



(No Model.)

. MLK'ENNEDY. DIE PUNCH FOR MAKING TURN BUOKLES.

No., 444,595. PatentedJan. 18, 1891.

" UNITED STATES PATENT OFFICE.

MARTIN KENNEDY, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE U. S. ROLLING STOCK COMPANY, OF SAME PLACE.

DIE-PUNCH FOR MAKING TU RN-BUCKLES.

SPECIFICATION forming part of Letters Patent No. 444,595, dated January 13, 1891.

Application filed March 17, 1890- Serial No. 344.108. (No model.)

To aZl whom it may concern: with the unequal distribution of resistance Be it known that I, MARTIN KENNEDY, a around the punch as it is driven forward intocitizen of the United States, residing at Chithe die, is almost sure to break the punch.

cago, in the county of Cook and State of Illi- The present invention is intended to obvinois, have invented certain new and useful ate this difficulty; and it consists in making Improvements in Die-Punches for Making the punch in separate pieces, whereby pro- Turn-Buckles, which are fully set forth in the vision is made for slight relative movement, following specification, reference being bad which will relieve the unequal strains upon to the accompanying drawings, in Which the punch and prevent breakage.

10 Figure 1 represents a side elevation of a I will proceed to describe in detail the conpunch embodying my invention and a porstruction of a punch in which I have emtion of a die-section; Fig. 2, a longitudinal bodied my invention in a practical Way, and section of the punch; Fig. 3, a side elevation will then point out definitely in claims the of the removable end of the punch detached; improvements which I believe to be new and x 5 Fig. 4, a longitudinal section of the stock porwish to protect by Letters Patent. I tion of the punch detached,and Fig. 5 a simi- In the drawings, A represents a small seclar section of the detachable collar. Fig. 1 tion of a two-part inclosing die, sufficient is on a scale by itself, and the remaining figthereof being shown for the purpose of illusures upon the same scale, but enlarged from trating the operation of the punch in connec- 20 that of Fig. 1. tion therewith, and the die being shown of My invention relates to a punch which is the construction specified in my above-menintended for use in the manufacture of turntioned application. The central core of this buckles as described in Letters Patent No. die is indicated by aand is hollow, as seen in 395,281 granted to me December 25,1888, and the drawings. The punch is composed of 25 in connection with inclosing dies as set forth three separate partsnamely, a stock or body in said patent, or as set forth in my applica- B, a stem or tip 0, and a collarD. The stock .tion, Serial No. 338,182, filed January 27,1890. B is of circular form, the middle portion be- In the manufacture of turn-buckles in the ing larger than the ends, the front end being manner referred to two bars having their turned down to the size of the opening in the 30 ends bent in a particular way are placed in end of the die, and the other end reduced inclosing dies and the heads of the turnslightly to adapt it for fitting to the plunger buckle are formed by upsetting the ends of or punch-holder, by which it is reciprocated. these bars within the dies byasuitable punch This piece is also bored in centrally from the entering the end of the latter. The die is front end some distance, so asto provide a 3 5 provided with a central core, which is bored circular socket b, and near the inner end or or hollow for the purpose of receiving the bottom of this socket small apertures b are small tip of the punch as it is driven in becut through the walls, being arranged ditween the ends of the two bars to upset the rectly opposite each other. This socket in latter to form the head of the turn-buckle, the stock is adapted to receive the stem or 40 and at the same time providing the required tip 0 with an easy fit, the size of the latter 9o central opening in this end by upsetting the being of course determined by the central metal around the end of the punch. In this opening in the core of the die, which it is to operation great force is exerted upon the dies enter as the punch is driven forward. Near and punch and the latter is subjected to very the end of the stem which enters the socket 45 severe strain as it is driven inward with the a hole 0 is cut to correspond with the openforce required to do the work. I have found ings b in the stock, and the stem is secured that if the punch is made in one piece, as is inits socket by inserting apinE through these usual for similar operations, it'is very liable several openings. As shown in the drawings, to break at the tip end. A slight deviation the stem is made to project from the stock 50 from adirect line in entering the die, together considerably more than is necessary, which is for the purpose of accommodating the short collar or sleeve D,which is constructed to fit loosely upon the stem in front of the stock, and is of such size as to be flush with this end of the stock when placed upon the stem, as seen in Figs. 1 and 2 of the drawings. Two apertures (Z are made in this collar arranged directly opposite each other, and a hole 0 is cut through the stem to correspond with these openings, thereby providing means for fastening the collar upon the stem by a pin F, which is passed through these several apertures. The collar is of such length as to leave a sufficient portion of the stem projecting therefrom to enter the die-core a suitable distance to give a firm support and bearing for the stem, while the head of the turnbuckle is formed around it. It is obvious that the diameter of the collar corresponds to the required diameter of the opening in the end of the die.

It will be understood that in operation the punch is driven forward into the die, and the collar coming in contact with the ends of the bars the latter will be upset by the inward movement of the pu noh,thereby forming the head between the collar and the core of the die and around the stem of the punch which has entered the opening in the core. On account of the construction of the punch in separate pieces and the fitting of said pieces together, as described, there is a slight yielding of the stem in its socket, and also a similar very slight movement of the collar on the stem. This slight play of the parts relatively is su fficient to counteract any slight variation from a direct line in the movement of the punch, and also the effect of inequality of pressure on different sides, so that the danger of breaking the stem is practically obviated. This result is accomplished to some extent without the collar, the stem being set in the stock, as described above, and the proportions of these two parts being correspondingly changed; but I have found by actual experience that this construction does not entirely relieve the difficulty, and that there will still be frequent breakage, although not to the same extent as when the punch is made in one entire piece. The application of the collar seems to provide an additional relief by a kind of differentiation of the yielding movement which reduces the probability of breakage almost to zero. It will be seen also that the parts of the punch are readily separable from each other by simply pushing out the fastening-pins E and F, and are connected to each other in working position with equal facility. The collar is also reversible, so that it may be changed when one end is broken down, and the punch will therefore last nearly twice as long as though solid. I wish to be understood, however, as including in my invention the punch when made in two partsthat is, the stock and the stem socketed therein, as described, but without the collarand also as the preferable construction the punch composed of the said two parts with the addition of the loose collar, as described.

In some details, such as the fastening devices and other like features, changes may be made without departing from the principle of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a die-punch for forging turnbuekles, a body or stock B,provided with a punchingstem, in combination with the independent loose collar surrounding the stem just in front of the stock, substantially as and for the purposes specified.

2. In a die-punch for forging turn-buckles, a stock 13, in combination with an independent stem 0, socketed in said stock, and an independent sleeve or collar D, applied to the stem in front of the stock, substantially as and for the purposes specified.

In a die-punch for forging turn-buckles, the stock B, provided with the socket b, in combination with the stem 0, fitted to said socket, the loose collar D, applied to the stem, and the fastening-pins E and F, substantially as and for the purposes specified.

MARTIN KENNEDY.

Witnesses:

CARRIE FEIGEL, A. M. BEST. 

